1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HID Sensors Driver 4 * Copyright (c) 2012, Intel Corporation. 5 */ 6 7 #include <linux/device.h> 8 #include <linux/hid.h> 9 #include <linux/module.h> 10 #include <linux/slab.h> 11 #include <linux/mfd/core.h> 12 #include <linux/list.h> 13 #include <linux/hid-sensor-ids.h> 14 #include <linux/hid-sensor-hub.h> 15 #include "hid-ids.h" 16 17 #define HID_SENSOR_HUB_ENUM_QUIRK 0x01 18 19 /** 20 * struct sensor_hub_data - Hold a instance data for a HID hub device 21 * @mutex: Mutex to serialize synchronous request. 22 * @lock: Spin lock to protect pending request structure. 23 * @dyn_callback_list: Holds callback function 24 * @dyn_callback_lock: spin lock to protect callback list 25 * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance. 26 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached). 27 * @ref_cnt: Number of MFD clients have opened this device 28 */ 29 struct sensor_hub_data { 30 struct mutex mutex; 31 spinlock_t lock; 32 struct list_head dyn_callback_list; 33 spinlock_t dyn_callback_lock; 34 struct mfd_cell *hid_sensor_hub_client_devs; 35 int hid_sensor_client_cnt; 36 int ref_cnt; 37 }; 38 39 /** 40 * struct hid_sensor_hub_callbacks_list - Stores callback list 41 * @list: list head. 42 * @usage_id: usage id for a physical device. 43 * @hsdev: Stored hid instance for current hub device. 44 * @usage_callback: Stores registered callback functions. 45 * @priv: Private data for a physical device. 46 */ 47 struct hid_sensor_hub_callbacks_list { 48 struct list_head list; 49 u32 usage_id; 50 struct hid_sensor_hub_device *hsdev; 51 struct hid_sensor_hub_callbacks *usage_callback; 52 void *priv; 53 }; 54 55 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev, 56 int dir) 57 { 58 struct hid_report *report; 59 60 list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) { 61 if (report->id == id) 62 return report; 63 } 64 hid_warn(hdev, "No report with id 0x%x found\n", id); 65 66 return NULL; 67 } 68 69 static int sensor_hub_get_physical_device_count(struct hid_device *hdev) 70 { 71 int i; 72 int count = 0; 73 74 for (i = 0; i < hdev->maxcollection; ++i) { 75 struct hid_collection *collection = &hdev->collection[i]; 76 if (collection->type == HID_COLLECTION_PHYSICAL || 77 collection->type == HID_COLLECTION_APPLICATION) 78 ++count; 79 } 80 81 return count; 82 } 83 84 static void sensor_hub_fill_attr_info( 85 struct hid_sensor_hub_attribute_info *info, 86 s32 index, s32 report_id, struct hid_field *field) 87 { 88 info->index = index; 89 info->report_id = report_id; 90 info->units = field->unit; 91 info->unit_expo = field->unit_exponent; 92 info->size = (field->report_size * field->report_count)/8; 93 info->logical_minimum = field->logical_minimum; 94 info->logical_maximum = field->logical_maximum; 95 } 96 97 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback( 98 struct hid_device *hdev, 99 u32 usage_id, 100 int collection_index, 101 struct hid_sensor_hub_device **hsdev, 102 void **priv) 103 { 104 struct hid_sensor_hub_callbacks_list *callback; 105 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 106 unsigned long flags; 107 108 spin_lock_irqsave(&pdata->dyn_callback_lock, flags); 109 list_for_each_entry(callback, &pdata->dyn_callback_list, list) 110 if ((callback->usage_id == usage_id || 111 callback->usage_id == HID_USAGE_SENSOR_COLLECTION) && 112 (collection_index >= 113 callback->hsdev->start_collection_index) && 114 (collection_index < 115 callback->hsdev->end_collection_index)) { 116 *priv = callback->priv; 117 *hsdev = callback->hsdev; 118 spin_unlock_irqrestore(&pdata->dyn_callback_lock, 119 flags); 120 return callback->usage_callback; 121 } 122 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 123 124 return NULL; 125 } 126 127 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev, 128 u32 usage_id, 129 struct hid_sensor_hub_callbacks *usage_callback) 130 { 131 struct hid_sensor_hub_callbacks_list *callback; 132 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev); 133 unsigned long flags; 134 135 spin_lock_irqsave(&pdata->dyn_callback_lock, flags); 136 list_for_each_entry(callback, &pdata->dyn_callback_list, list) 137 if (callback->usage_id == usage_id && 138 callback->hsdev == hsdev) { 139 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 140 return -EINVAL; 141 } 142 callback = kzalloc_obj(*callback, GFP_ATOMIC); 143 if (!callback) { 144 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 145 return -ENOMEM; 146 } 147 callback->hsdev = hsdev; 148 callback->usage_callback = usage_callback; 149 callback->usage_id = usage_id; 150 callback->priv = NULL; 151 /* 152 * If there is a handler registered for the collection type, then 153 * it will handle all reports for sensors in this collection. If 154 * there is also an individual sensor handler registration, then 155 * we want to make sure that the reports are directed to collection 156 * handler, as this may be a fusion sensor. So add collection handlers 157 * to the beginning of the list, so that they are matched first. 158 */ 159 if (usage_id == HID_USAGE_SENSOR_COLLECTION) 160 list_add(&callback->list, &pdata->dyn_callback_list); 161 else 162 list_add_tail(&callback->list, &pdata->dyn_callback_list); 163 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 164 165 return 0; 166 } 167 EXPORT_SYMBOL_GPL(sensor_hub_register_callback); 168 169 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev, 170 u32 usage_id) 171 { 172 struct hid_sensor_hub_callbacks_list *callback; 173 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev); 174 unsigned long flags; 175 176 spin_lock_irqsave(&pdata->dyn_callback_lock, flags); 177 list_for_each_entry(callback, &pdata->dyn_callback_list, list) 178 if (callback->usage_id == usage_id && 179 callback->hsdev == hsdev) { 180 list_del(&callback->list); 181 kfree(callback); 182 break; 183 } 184 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 185 186 return 0; 187 } 188 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback); 189 190 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, 191 u32 field_index, int buffer_size, void *buffer) 192 { 193 struct hid_report *report; 194 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 195 __s32 *buf32 = buffer; 196 int i = 0; 197 int remaining_bytes; 198 __s32 value; 199 int ret = 0; 200 201 mutex_lock(&data->mutex); 202 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); 203 if (!report || (field_index >= report->maxfield)) { 204 ret = -EINVAL; 205 goto done_proc; 206 } 207 208 remaining_bytes = buffer_size % sizeof(__s32); 209 buffer_size = buffer_size / sizeof(__s32); 210 if (buffer_size) { 211 for (i = 0; i < buffer_size; ++i) { 212 ret = hid_set_field(report->field[field_index], i, 213 (__force __s32)cpu_to_le32(*buf32)); 214 if (ret) 215 goto done_proc; 216 217 ++buf32; 218 } 219 } 220 if (remaining_bytes) { 221 value = 0; 222 memcpy(&value, (u8 *)buf32, remaining_bytes); 223 ret = hid_set_field(report->field[field_index], i, 224 (__force __s32)cpu_to_le32(value)); 225 if (ret) 226 goto done_proc; 227 } 228 hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT); 229 hid_hw_wait(hsdev->hdev); 230 231 done_proc: 232 mutex_unlock(&data->mutex); 233 234 return ret; 235 } 236 EXPORT_SYMBOL_GPL(sensor_hub_set_feature); 237 238 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, 239 u32 field_index, int buffer_size, void *buffer) 240 { 241 struct hid_report *report; 242 struct hid_field *field; 243 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 244 size_t field_size; 245 size_t report_size; 246 size_t copied = 0; 247 size_t to_copy; 248 int ret = 0; 249 unsigned int i; 250 251 if (!buffer || buffer_size <= 0) 252 return -EINVAL; 253 254 memset(buffer, 0, buffer_size); 255 256 mutex_lock(&data->mutex); 257 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); 258 if (!report || (field_index >= report->maxfield) || 259 report->field[field_index]->report_count < 1) { 260 ret = -EINVAL; 261 goto done_proc; 262 } 263 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT); 264 hid_hw_wait(hsdev->hdev); 265 266 field = report->field[field_index]; 267 268 /* calculate number of bytes required to read this field */ 269 field_size = DIV_ROUND_UP(field->report_size, 8); 270 /* HID core stores each parsed report value in a __s32 slot. */ 271 if (!field_size || field_size > sizeof(field->value[0])) { 272 ret = -EINVAL; 273 goto done_proc; 274 } 275 if (field->report_count > SIZE_MAX / field_size) { 276 ret = -EINVAL; 277 goto done_proc; 278 } 279 280 report_size = field_size * field->report_count; 281 report_size = min_t(size_t, report_size, buffer_size); 282 283 for (i = 0; i < field->report_count && copied < report_size; ++i) { 284 to_copy = min(field_size, report_size - copied); 285 memcpy(&((u8 *)buffer)[copied], &field->value[i], to_copy); 286 copied += to_copy; 287 } 288 ret = copied; 289 290 done_proc: 291 mutex_unlock(&data->mutex); 292 293 return ret; 294 } 295 EXPORT_SYMBOL_GPL(sensor_hub_get_feature); 296 297 int sensor_hub_input_attr_read_values(struct hid_sensor_hub_device *hsdev, 298 u32 usage_id, u32 attr_usage_id, 299 u32 report_id, 300 enum sensor_hub_read_flags flag, 301 u32 buffer_size, u8 *buffer) 302 { 303 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 304 struct hid_report *report; 305 unsigned long flags; 306 long cycles; 307 int ret; 308 309 report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT); 310 if (!report) 311 return -EINVAL; 312 313 mutex_lock(hsdev->mutex_ptr); 314 if (flag == SENSOR_HUB_SYNC) { 315 memset(&hsdev->pending, 0, sizeof(hsdev->pending)); 316 init_completion(&hsdev->pending.ready); 317 hsdev->pending.usage_id = usage_id; 318 hsdev->pending.attr_usage_id = attr_usage_id; 319 hsdev->pending.max_raw_size = buffer_size; 320 hsdev->pending.raw_data = buffer; 321 322 spin_lock_irqsave(&data->lock, flags); 323 hsdev->pending.status = true; 324 spin_unlock_irqrestore(&data->lock, flags); 325 } 326 mutex_lock(&data->mutex); 327 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT); 328 mutex_unlock(&data->mutex); 329 ret = 0; 330 if (flag == SENSOR_HUB_SYNC) { 331 cycles = wait_for_completion_interruptible_timeout(&hsdev->pending.ready, 332 HZ * 5); 333 if (cycles == 0) 334 ret = -ETIMEDOUT; 335 else if (cycles < 0) 336 ret = cycles; 337 338 hsdev->pending.status = false; 339 } 340 mutex_unlock(hsdev->mutex_ptr); 341 342 return ret; 343 } 344 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_read_values); 345 346 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev, 347 u32 usage_id, 348 u32 attr_usage_id, u32 report_id, 349 enum sensor_hub_read_flags flag, 350 bool is_signed) 351 { 352 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 353 unsigned long flags; 354 struct hid_report *report; 355 int ret_val = 0; 356 357 report = sensor_hub_report(report_id, hsdev->hdev, 358 HID_INPUT_REPORT); 359 if (!report) 360 return -EINVAL; 361 362 mutex_lock(hsdev->mutex_ptr); 363 if (flag == SENSOR_HUB_SYNC) { 364 memset(&hsdev->pending, 0, sizeof(hsdev->pending)); 365 init_completion(&hsdev->pending.ready); 366 hsdev->pending.usage_id = usage_id; 367 hsdev->pending.attr_usage_id = attr_usage_id; 368 hsdev->pending.raw_size = 0; 369 370 spin_lock_irqsave(&data->lock, flags); 371 hsdev->pending.status = true; 372 spin_unlock_irqrestore(&data->lock, flags); 373 } 374 mutex_lock(&data->mutex); 375 hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT); 376 mutex_unlock(&data->mutex); 377 if (flag == SENSOR_HUB_SYNC) { 378 wait_for_completion_interruptible_timeout( 379 &hsdev->pending.ready, HZ*5); 380 switch (hsdev->pending.raw_size) { 381 case 1: 382 if (is_signed) 383 ret_val = *(s8 *)hsdev->pending.raw_data; 384 else 385 ret_val = *(u8 *)hsdev->pending.raw_data; 386 break; 387 case 2: 388 if (is_signed) 389 ret_val = *(s16 *)hsdev->pending.raw_data; 390 else 391 ret_val = *(u16 *)hsdev->pending.raw_data; 392 break; 393 case 4: 394 ret_val = *(u32 *)hsdev->pending.raw_data; 395 break; 396 default: 397 ret_val = 0; 398 } 399 kfree(hsdev->pending.raw_data); 400 hsdev->pending.status = false; 401 } 402 mutex_unlock(hsdev->mutex_ptr); 403 404 return ret_val; 405 } 406 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value); 407 408 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev, 409 u32 report_id, int field_index, u32 usage_id) 410 { 411 struct hid_report *report; 412 struct hid_field *field; 413 int i; 414 415 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); 416 if (!report || (field_index >= report->maxfield)) 417 goto done_proc; 418 419 field = report->field[field_index]; 420 for (i = 0; i < field->maxusage; ++i) { 421 if (field->usage[i].hid == usage_id) 422 return field->usage[i].usage_index; 423 } 424 425 done_proc: 426 return -EINVAL; 427 } 428 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index); 429 430 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev, 431 u8 type, 432 u32 usage_id, 433 u32 attr_usage_id, 434 struct hid_sensor_hub_attribute_info *info) 435 { 436 int ret = -1; 437 int i; 438 struct hid_report *report; 439 struct hid_field *field; 440 struct hid_report_enum *report_enum; 441 struct hid_device *hdev = hsdev->hdev; 442 443 /* Initialize with defaults */ 444 info->usage_id = usage_id; 445 info->attrib_id = attr_usage_id; 446 info->report_id = -1; 447 info->index = -1; 448 info->units = -1; 449 info->unit_expo = -1; 450 451 report_enum = &hdev->report_enum[type]; 452 list_for_each_entry(report, &report_enum->report_list, list) { 453 for (i = 0; i < report->maxfield; ++i) { 454 field = report->field[i]; 455 if (field->maxusage) { 456 if ((field->physical == usage_id || 457 field->application == usage_id) && 458 (field->logical == attr_usage_id || 459 field->usage[0].hid == 460 attr_usage_id) && 461 (field->usage[0].collection_index >= 462 hsdev->start_collection_index) && 463 (field->usage[0].collection_index < 464 hsdev->end_collection_index)) { 465 466 sensor_hub_fill_attr_info(info, i, 467 report->id, 468 field); 469 ret = 0; 470 break; 471 } 472 } 473 } 474 475 } 476 477 return ret; 478 } 479 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info); 480 481 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message) 482 { 483 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 484 struct hid_sensor_hub_callbacks_list *callback; 485 unsigned long flags; 486 487 hid_dbg(hdev, " sensor_hub_suspend\n"); 488 spin_lock_irqsave(&pdata->dyn_callback_lock, flags); 489 list_for_each_entry(callback, &pdata->dyn_callback_list, list) { 490 if (callback->usage_callback->suspend) 491 callback->usage_callback->suspend( 492 callback->hsdev, callback->priv); 493 } 494 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 495 496 return 0; 497 } 498 499 static int sensor_hub_resume(struct hid_device *hdev) 500 { 501 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 502 struct hid_sensor_hub_callbacks_list *callback; 503 unsigned long flags; 504 505 hid_dbg(hdev, " sensor_hub_resume\n"); 506 spin_lock_irqsave(&pdata->dyn_callback_lock, flags); 507 list_for_each_entry(callback, &pdata->dyn_callback_list, list) { 508 if (callback->usage_callback->resume) 509 callback->usage_callback->resume( 510 callback->hsdev, callback->priv); 511 } 512 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags); 513 514 return 0; 515 } 516 517 static int sensor_hub_reset_resume(struct hid_device *hdev) 518 { 519 return 0; 520 } 521 522 /* 523 * Handle raw report as sent by device 524 */ 525 static int sensor_hub_raw_event(struct hid_device *hdev, 526 struct hid_report *report, u8 *raw_data, int size) 527 { 528 int i; 529 u8 *ptr; 530 int sz; 531 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 532 unsigned long flags; 533 struct hid_sensor_hub_callbacks *callback = NULL; 534 struct hid_collection *collection = NULL; 535 void *priv = NULL; 536 struct hid_sensor_hub_device *hsdev = NULL; 537 u32 copy_size; 538 u32 avail; 539 540 hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n", 541 report->id, size, report->type); 542 hid_dbg(hdev, "maxfield:%d\n", report->maxfield); 543 if (report->type != HID_INPUT_REPORT) 544 return 1; 545 546 ptr = raw_data; 547 if (report->id) 548 ptr++; /* Skip report id */ 549 550 spin_lock_irqsave(&pdata->lock, flags); 551 552 for (i = 0; i < report->maxfield; ++i) { 553 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n", 554 i, report->field[i]->usage->collection_index, 555 report->field[i]->usage->hid, 556 (report->field[i]->report_size * 557 report->field[i]->report_count)/8); 558 sz = (report->field[i]->report_size * 559 report->field[i]->report_count)/8; 560 collection = &hdev->collection[ 561 report->field[i]->usage->collection_index]; 562 hid_dbg(hdev, "collection->usage %x\n", 563 collection->usage); 564 565 callback = sensor_hub_get_callback(hdev, 566 report->field[i]->physical ? report->field[i]->physical : 567 report->field[i]->application, 568 report->field[i]->usage[0].collection_index, 569 &hsdev, &priv); 570 if (!callback) { 571 ptr += sz; 572 continue; 573 } 574 if (hsdev->pending.status && (hsdev->pending.attr_usage_id == 575 report->field[i]->usage->hid || 576 hsdev->pending.attr_usage_id == 577 report->field[i]->logical)) { 578 hid_dbg(hdev, "data was pending ...\n"); 579 if (hsdev->pending.max_raw_size) { 580 if (hsdev->pending.index < hsdev->pending.max_raw_size) { 581 avail = hsdev->pending.max_raw_size - hsdev->pending.index; 582 copy_size = clamp(sz, 0U, avail); 583 584 memcpy(hsdev->pending.raw_data + hsdev->pending.index, 585 ptr, copy_size); 586 hsdev->pending.index += copy_size; 587 if (hsdev->pending.index >= hsdev->pending.max_raw_size) { 588 hsdev->pending.raw_size = hsdev->pending.index; 589 complete(&hsdev->pending.ready); 590 } 591 } 592 } else { 593 hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC); 594 if (hsdev->pending.raw_data) 595 hsdev->pending.raw_size = sz; 596 else 597 hsdev->pending.raw_size = 0; 598 complete(&hsdev->pending.ready); 599 } 600 } 601 if (callback->capture_sample) { 602 if (report->field[i]->logical) 603 callback->capture_sample(hsdev, 604 report->field[i]->logical, sz, ptr, 605 callback->pdev); 606 else 607 callback->capture_sample(hsdev, 608 report->field[i]->usage->hid, sz, ptr, 609 callback->pdev); 610 } 611 ptr += sz; 612 } 613 if (callback && collection && callback->send_event) 614 callback->send_event(hsdev, collection->usage, 615 callback->pdev); 616 spin_unlock_irqrestore(&pdata->lock, flags); 617 618 return 1; 619 } 620 621 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev) 622 { 623 int ret = 0; 624 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 625 626 mutex_lock(&data->mutex); 627 if (!data->ref_cnt) { 628 ret = hid_hw_open(hsdev->hdev); 629 if (ret) { 630 hid_err(hsdev->hdev, "failed to open hid device\n"); 631 mutex_unlock(&data->mutex); 632 return ret; 633 } 634 } 635 data->ref_cnt++; 636 mutex_unlock(&data->mutex); 637 638 return ret; 639 } 640 EXPORT_SYMBOL_GPL(sensor_hub_device_open); 641 642 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev) 643 { 644 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 645 646 mutex_lock(&data->mutex); 647 data->ref_cnt--; 648 if (!data->ref_cnt) 649 hid_hw_close(hsdev->hdev); 650 mutex_unlock(&data->mutex); 651 } 652 EXPORT_SYMBOL_GPL(sensor_hub_device_close); 653 654 static const __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc, 655 unsigned int *rsize) 656 { 657 /* 658 * Checks if the report descriptor of Thinkpad Helix 2 has a logical 659 * minimum for magnetic flux axis greater than the maximum. 660 */ 661 if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA && 662 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 && 663 rdesc[915] == 0x81 && rdesc[916] == 0x08 && 664 rdesc[917] == 0x00 && rdesc[918] == 0x27 && 665 rdesc[921] == 0x07 && rdesc[922] == 0x00) { 666 /* Sets negative logical minimum for mag x, y and z */ 667 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0; 668 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e; 669 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7; 670 rdesc[917] = rdesc[938] = rdesc[959] = 0xff; 671 } 672 673 return rdesc; 674 } 675 676 static int sensor_hub_probe(struct hid_device *hdev, 677 const struct hid_device_id *id) 678 { 679 int ret; 680 struct sensor_hub_data *sd; 681 int i; 682 char *name; 683 int dev_cnt; 684 struct hid_sensor_hub_device *hsdev; 685 struct hid_sensor_hub_device *last_hsdev = NULL; 686 struct hid_sensor_hub_device *collection_hsdev = NULL; 687 688 sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL); 689 if (!sd) { 690 hid_err(hdev, "cannot allocate Sensor data\n"); 691 return -ENOMEM; 692 } 693 694 hid_set_drvdata(hdev, sd); 695 696 spin_lock_init(&sd->lock); 697 spin_lock_init(&sd->dyn_callback_lock); 698 mutex_init(&sd->mutex); 699 ret = hid_parse(hdev); 700 if (ret) { 701 hid_err(hdev, "parse failed\n"); 702 return ret; 703 } 704 INIT_LIST_HEAD(&hdev->inputs); 705 706 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT | HID_CONNECT_DRIVER); 707 if (ret) { 708 hid_err(hdev, "hw start failed\n"); 709 return ret; 710 } 711 INIT_LIST_HEAD(&sd->dyn_callback_list); 712 sd->hid_sensor_client_cnt = 0; 713 714 dev_cnt = sensor_hub_get_physical_device_count(hdev); 715 if (dev_cnt > HID_MAX_PHY_DEVICES) { 716 hid_err(hdev, "Invalid Physical device count\n"); 717 ret = -EINVAL; 718 goto err_stop_hw; 719 } 720 sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev, 721 dev_cnt, 722 sizeof(struct mfd_cell), 723 GFP_KERNEL); 724 if (sd->hid_sensor_hub_client_devs == NULL) { 725 hid_err(hdev, "Failed to allocate memory for mfd cells\n"); 726 ret = -ENOMEM; 727 goto err_stop_hw; 728 } 729 730 for (i = 0; i < hdev->maxcollection; ++i) { 731 struct hid_collection *collection = &hdev->collection[i]; 732 733 if (collection->type == HID_COLLECTION_PHYSICAL || 734 collection->type == HID_COLLECTION_APPLICATION) { 735 736 hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev), 737 GFP_KERNEL); 738 if (!hsdev) { 739 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n"); 740 ret = -ENOMEM; 741 goto err_stop_hw; 742 } 743 hsdev->hdev = hdev; 744 hsdev->vendor_id = hdev->vendor; 745 hsdev->product_id = hdev->product; 746 hsdev->usage = collection->usage; 747 hsdev->mutex_ptr = devm_kzalloc(&hdev->dev, 748 sizeof(struct mutex), 749 GFP_KERNEL); 750 if (!hsdev->mutex_ptr) { 751 ret = -ENOMEM; 752 goto err_stop_hw; 753 } 754 mutex_init(hsdev->mutex_ptr); 755 hsdev->start_collection_index = i; 756 if (last_hsdev) 757 last_hsdev->end_collection_index = i; 758 last_hsdev = hsdev; 759 name = devm_kasprintf(&hdev->dev, GFP_KERNEL, 760 "HID-SENSOR-%x", 761 collection->usage); 762 if (name == NULL) { 763 hid_err(hdev, "Failed MFD device name\n"); 764 ret = -ENOMEM; 765 goto err_stop_hw; 766 } 767 sd->hid_sensor_hub_client_devs[ 768 sd->hid_sensor_client_cnt].name = name; 769 sd->hid_sensor_hub_client_devs[ 770 sd->hid_sensor_client_cnt].platform_data = 771 hsdev; 772 sd->hid_sensor_hub_client_devs[ 773 sd->hid_sensor_client_cnt].pdata_size = 774 sizeof(*hsdev); 775 hid_dbg(hdev, "Adding %s:%d\n", name, 776 hsdev->start_collection_index); 777 sd->hid_sensor_client_cnt++; 778 if (collection_hsdev) 779 collection_hsdev->end_collection_index = i; 780 if (collection->type == HID_COLLECTION_APPLICATION && 781 collection->usage == HID_USAGE_SENSOR_COLLECTION) 782 collection_hsdev = hsdev; 783 } 784 } 785 if (last_hsdev) 786 last_hsdev->end_collection_index = i; 787 if (collection_hsdev) 788 collection_hsdev->end_collection_index = i; 789 790 ret = mfd_add_hotplug_devices(&hdev->dev, 791 sd->hid_sensor_hub_client_devs, 792 sd->hid_sensor_client_cnt); 793 if (ret < 0) 794 goto err_stop_hw; 795 796 return ret; 797 798 err_stop_hw: 799 hid_hw_stop(hdev); 800 801 return ret; 802 } 803 804 static int sensor_hub_finalize_pending_fn(struct device *dev, void *data) 805 { 806 struct hid_sensor_hub_device *hsdev = dev->platform_data; 807 808 if (hsdev->pending.status) 809 complete(&hsdev->pending.ready); 810 811 return 0; 812 } 813 814 static void sensor_hub_remove(struct hid_device *hdev) 815 { 816 struct sensor_hub_data *data = hid_get_drvdata(hdev); 817 unsigned long flags; 818 819 hid_dbg(hdev, " hardware removed\n"); 820 hid_hw_close(hdev); 821 hid_hw_stop(hdev); 822 823 spin_lock_irqsave(&data->lock, flags); 824 device_for_each_child(&hdev->dev, NULL, 825 sensor_hub_finalize_pending_fn); 826 spin_unlock_irqrestore(&data->lock, flags); 827 828 mfd_remove_devices(&hdev->dev); 829 mutex_destroy(&data->mutex); 830 } 831 832 static const struct hid_device_id sensor_hub_devices[] = { 833 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID, 834 HID_ANY_ID) }, 835 { } 836 }; 837 MODULE_DEVICE_TABLE(hid, sensor_hub_devices); 838 839 static struct hid_driver sensor_hub_driver = { 840 .name = "hid-sensor-hub", 841 .id_table = sensor_hub_devices, 842 .probe = sensor_hub_probe, 843 .remove = sensor_hub_remove, 844 .raw_event = sensor_hub_raw_event, 845 .report_fixup = sensor_hub_report_fixup, 846 .suspend = pm_ptr(sensor_hub_suspend), 847 .resume = pm_ptr(sensor_hub_resume), 848 .reset_resume = pm_ptr(sensor_hub_reset_resume), 849 }; 850 module_hid_driver(sensor_hub_driver); 851 852 MODULE_DESCRIPTION("HID Sensor Hub driver"); 853 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 854 MODULE_LICENSE("GPL"); 855